untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms of untreated

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

When left untreated, the virus can progress to Acquired Immunodeficiency Syndrome (AIDS), making the body highly susceptible to fatal illnesses and cancers. — Lex Harvey, CNN Money, 16 Sep. 2026

Many dogs, like Athena, are malnourished and have untreated health issues. — Sandra McDonald, Los Angeles Times, 15 Sep. 2026

Be sure to purchase untreated seed that is specifically labeled for sprouting. — Kim Toscano, Southern Living, 14 Sep. 2026

The untreated group developed significant and widespread inflammation (as measured by DTI imaging) over the season, where no inflammation was present in the group treated with itPBM. — Mirin Fader, New York Times, 11 Sep. 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease